import datetime

from django.utils.deprecation import MiddlewareMixin
from web import models
from django.shortcuts import render, redirect
from django.conf import settings


class Tracer(object):
    def __init__(self):
        self.user = None
        self.price_policy = None
        self.project = None


class AuthMiddleware(MiddlewareMixin):
    def process_request(self, request):
        '''如果用户登陆了，则request赋值'''
        request.tracer = Tracer()
        user_id = request.session.get("user_id", 0)
        user_object = models.UserInfo.objects.filter(id=user_id).first()
        request.tracer.user = user_object

        # 获取白名单：没有登录都可以访问
        '''
        1. 获取当前用户访问的url
        2. 检查URL是否在白名单中，如果有则继续向后访问，否则检查用户是否登录
        '''
        if request.path_info in settings.WHITE_REGEX_URL_LIST:
            return  # 默认为null

        # 检查用户是否已登录，已登录继续往后走，未登录则返回登录界面
        if not request.tracer.user:
            return redirect('login')

        _object = models.Transaction.objects.filter(user=user_object, status=2).order_by('-id').first()
        # 判断是否已过期
        current_datetime = datetime.datetime.now()
        if _object.end_datetime and _object.end_datetime < current_datetime:
            _object = models.Transaction.objects.filter(user=user_object, status=2, price_policy__category=1).first()

        request.tracer.price_policy = _object.price_policy

    def process_view(self, request, view, args, kwargs):
        if not request.path_info.startswith('/manage/'):
            return
        project_id = kwargs.get('project_id')

        # 是我创建的项目
        project_object = models.Project.objects.filter(creator=request.tracer.user, id=project_id).first()
        if project_object:
            request.tracer.project = project_object.project
            return

        # 我参与的项目
        project_user_object = models.ProjectUser.objects.filter(user=request.tracer.user, project_id=project_id).first()
        if project_user_object:
            request.tracer.project = project_user_object.project
            return

        return redirect('project_list')
